The 2.2.1-alpha1 release addresses a few larger changes in Serendipity. These are the key points of the release:

PHP 7.2 support (including a new autologin token system and bcrypt password hashing)

Add function to add multiple images to an enty at once, creating a gallery

Added a maintenance mode option

Upgrade Smarty to 3.1.32

Bootstrap4 adaptations

Fixes for plugin drag'n'drop

Improvements to the p-mode of nl2br plugin

Ability to create responsive image thumbnails

Improvements to local caching

Rework of moving media items (work in progress)

We would love to get feedback from our users. Be sure to try out the new release only on test/development blogs yet. If you absolutely want to test it on production blogs, make sure to have a backup available.